More power-ups
Pause game play and press [Up]x2, [Down]x2,
[Left], [Right], [Left], [Right], [B],
[A], [Start].
Options mode
Pause game play and press [Up]x2, [Down]x2,
[Left], [Right], [Left], [Right], [A]
+ [B], Start. Weapons, shields, missiles, and lasers may
now be available.
Full speed and shields
Pause game play and press [B]x5, [A]x5,
[Start].
Destroy all on-screen enemies
Pause game play and press [Up], [Right],
[Down], [Left], [Up], [Right], [Down],
[Left], [B], [A].
Expert mode
Pause game play and press [Up], [Select],
[Down], [Select], [Left], [Select], [Right],
[Select]x3. Collecting power-ups will have no effect on
your ship.
Remove current power-up
Pause game play and press [[A], [Left]] five
times.
Bonus levels
Level 2
Destroy the volcano towards the top after the ceiling drops
and rises. Fly through the hole where the volcano was located.
Level 4
Destroy the second Re-Bone blocking the narrow passage near
the end of the level. Fly to the bottom of the passage to reach
the wall behind your ship.